Elevator.



SJBRUCBl ELEVATOR.

APPLICATION FILED 001.17. 1907;

Patented Oct. 27, 1908.

l warum. MW

- illustrated a simple. and preferred form of i but that changes, alterations and modicai SAMUEL BRUCE, Ql" HELYLTIA, PEXSYLVAXIA.

ELEVATOR.

Specification of Letters Patent.

Patented oet. 27, isos.

Application filed October 17, 1907. Serial No. 397,862.

To all whom it may concern:

Be it known that I, SAMUEL BRUCE, a citi- L zen of the United States', residing at 'Helvet-ia, in t-he county of Cleariield and State of Pennsylvania, have invented new and useful Improvements in'Elevat'ors, ofwhich the following is a specification. v

This invention relates to elevators and it has particular reference to an improved safety appliance which is designed, in the event of breakage of .the hoistingcable, to engage the side walls or the guide rails in .the elevator shaft and to prevent the cage og cr from dropping` or descending into the s a A ,further object of the invention is to provide simple and efficient means for regu. lating the tension of the operating spring of the safety appliance.

lVit-h these and other 'ends4 in view which will readily appear as the natureof the invention is better understood, the same consists in the improved construction and novel arrangement andv combination vof parts whichv will be hereinafter fully describedl and 'particularly' pointed out in the claims.

In the accompanying drawings has been the invention it being however, understood that no limitation is necessarily made to the'V precise structural details therein exhibited,

tions within `the scopeof the invention may be resorted to when desired.

yIn the drawing, Figure 1 is a perspective -view of an elevator -car or cage equipped with thev improved safety appliance, the car being fs'hown in operative position between.

the-guide rails. F ig. l2is a side elevation partly in section. Fig. 3 is avertit-al sectional view taken 'through the casing' of the actuating spring and related parts.

Corresponding parts inthe several figures are denoted by like characters of reference.

The elevator car or cage, C, comprises the side members or uprights 1-1, the sills 2 2, the floor 3 and the cap beam 4, which connects the -upper ends of the side members. The latter are vertically grooved in the usual manner to engage the guide raise- 5, which latter extend vertically through the elevator shaft in the usual manner. u

Firmly bolted or otherwise secured upon the cap beamV 4 in registry with the vertical.

aperture 6 in'saidcap beam is a tubular casing 7 which is preferably of cylindrical ,I shape and provided at its lower edge with I an annular flange 8 for the passage of the bolts or fastening members .9; whereby the casing is secured upon the cap beam. The i upper end yof the casing 7 is exteriorly screw threaded for the reception ofI aninteriorly screw threaded cap l() having a central aper- `ture surrounded. by a v guide flange 11 through which ,is guided a stem 12, the lower extremity of which is enlarged to form a head 13 whichI is guided inthe aperture (i of the cap beam; said head and aperture being preferablyv of non-circular cross-section. The stem 12 is provided with an annular .Flange or collar 14, and upon said stem, be-

tween thevflange 1% and the cap 10 there is coiled avpowerful helical spring 15. It will be readily seen that the tension of this spring may be regulated by properly adj nsting the cap upon the screw threaded casing 7 since, by moving the cap in an upward direction 'additional rooln is given for the spring to expand. l The upper extremity of the stem l2 is connected by a link or clevis 16 with the lower end Vof Lthe flexible hoisting element 17'; the weight of the car or cage will thus be supported upon the spring which lat'- ter, by the weight of the car, is compressed between the iiange 14 and the cap 10, which late the tension of'the spring. The lower by flexible elements such asc-hains 18 with the capl beam '4; said chains being of such length that, when the car or cage 1s loaded, they will become" taut, thus relieving the from being overloaded. f

The head or enlargement 13 at the lower end of the stem 12 is provided with dogs 19 pi-votally connected therewith, and guided through apertures 2 0 in the 'side members ot the car or cage; the sharp pointed ex# tremities of said dogs being adapted to engage the uprights or guide rails 5-5. It will `be understood, however,'that under northe dogs 19 will clear the rails 5 5, the

move it downward against the tension of the supporting spring 15 to compress the 12 to move in anV upward direction suficiently. to move the dogs 19 clear ofthe rails, as described. 1n the event,'however.

latterhas been previously adjusted to regu` mal conditions, the pointed extremities of' weight of the car or cage being suicient to 4 end of the hoisting element 17 is connected.-

spring ,and 'preventing injury to the latter latter to some extent, permitting the -stem Y f breakage of spring 15 'will instantly expand', forcing vthe .a oylndrmal easing secureelV upon 'the cap the p ointedextremites .ofthe dogs 1'9 into tremely simple in oonstruotlon and efficient f cage, .making threaded: ca pfaij l1-stably i conneoted' with the eas`1ng, i .'mg an annular flange and a heador -enlarge1nent, the latter 'guided in the aperture the hoisting imnt '17,-' he stem 12 in adownward diretion, and forcing --active engagementvwththe,rails 5-,j5, thus.\ lcheckingand .preve tingthe'-descent of the oars. ,n

-. This improved safety appliance 1s eX- the guide openingsin the side members ol' 'n'operaton; and the actuating spring also serves to support the 4Weight of the Car .or a resilientfconnection between the" latter 4an'd`.the hoisting element.

Having thus fully described the inven-v `tion,vs7hat is vclaimed as'neW 1s An elevator oar/having side members and a capl beam,

"tween the annular l'a'n'geV and the adjustable cap of the easing, a

lthe hoisting element with the caploea1n. 4

in presence of. two. Witnesses. l' the former proyided with guide AMUEJ BRUCE. openings and the latter With anaperture, A j

Witnesses: JAMES H. GLnAsoN,`-

-beam in-registrywth the aperture, a screw'v ANNA Hron..

a stem. guided through ,the cap] have' in the Capbeam, normally inclined dogs con!` ment andslid ably. and .piyotallymounted inf `the can a Spring coiled ll'pon'the-stem'be-y a0 flexible hoisting element ,connected with the upperencl of the stem, and auxiliary. flexible 'elements lconnecting v In testimony whereof 1 afxrmyysglllvature. 35. 

